Dado-forming machine



April 9, J. E. ERICKSON DADO FORMING MACHINE Filed Oct. 19, 1925 3Sheets-Sheet /7/1/ WIII'" [/v YEN TOR JoH/vfl E'fi/CKLSON zifwzf MMW/7TTOR/VEY6 D APril 9, 1929- J. E. ERICKSON I 1,703,609

DADQ FORMING MACHINE Filed Oct. 19, 1925 s Sheets-Sheet 2 I/VVENTOR"JOHN E Ema/r6 o/v #7- TOR/YE Y6 April 1929- J. E. ERICKSON 1,708,609

DADO FORMING MACHINE Filed Oct-l9, 1925 5 SheetS -Sheet 5 24 2% Z? /8 K\7 [/v vz/vron F766 JOHNE R/c'mso/v ITTORNEYJ Patented Apr; 9, 1929.

UNITEDSTATES PATENT oFFIcE.

JOHN E. EBIGKSOI-I, 0F STJPAUL, IJINNESOTA, ASSIGNGR T0 ANDEESEN LUMBERCG PANY, OF BAYIPOBT, IrIINIIESOTA, A CORPORATION OF WISCONSIN.

nAno roni/rnro MACHINE.

Application filed Getooer 19, 1925. Serial No. 63,318. In themanufacture of window frames of the mullion or double winciowtype, ithasbeen customary to cut parallel grooves,

mortises'or dadoes in. the upper surface of 7 tion of the knife holdershowing the means the sill near the middle portion thereof, to foraligning the dado-cutting knives there receive the lower ends oiadjacent window in jambs. These grooves or dadoes extend. is a sectionalview on the line only partially across the sill and are there of Figure6; fore blind, and the tool in cut ing or form- Figure 7 is a detailsectional view on ing them, leaves a beveled or inclined surthe line 7""of Figure 6; face at the inner ends and this has been Figure 8 is aperspective view of one of cut out manually by a chisel or othersuitathe knives by means of which the dado 01- ble tool to form a squareshoulder or vergroove is out; tical face at the inner ends or" thedadoes Figure 9 is a perspective view of a mullion against which theedges of the jainbs will be window sill showing the position of thesnugly seated to form a tight substantially dadocs' therein;weather-proof joint. Two operations have Figure 10 is a transversesectional view of heretofore been necessary in forming the the sillshowing the dado therein and the grooves, one to cut them to therequired square shoulder or face atthe inner end depth using asuitable'machine, and th' thereof. othera hand operation to provide-asquare In the drawing, 2 represents the base of shoulder the inner endof each blind the machine and 8 upright standards theregroove 011. i isa drive shaft journaled in suitable The object oi my invention is toprovide bearings in the upper rear portions of said a machine in which,by a single operation, standards. This shaft projects outwardly beyondthe bearings at each end and, one end the sill grooves or dadoes' may beout, and asquare. shoulder formed at the inner ends is provided with asuitable driving pulley A yoke 6 has arms 7 ournaled on the thereof withthe same operation, thereby 5.

pro ecting ends of the shaft 4 and adapted efiecting a consicerablesaving in time and dispensing with the usualmanual operation. tooscillate vertically thereon; A series of eccentrics 8, 9, 10 and 11 aremounted on the ing the manner ting knives;

Figure 6 1s a detall view partially in secof mounting the dado-cu therobjects of the invention will appear from tne following detaileddescripshaft l,the eccentrics Sand 9 being splincd i thereon by means ofthe feather or key 12 The invention consists generally in variousconstructions and combinations all as hereinafter described andparticularly pointed out in the claims.

In the accompanying drawings forming art of this specification,

Figure l is a vertical transverse sectional view through a dadoingmachine embodying my invent-ion. v

Figure 2 is a detail'view partially in section of the upper portion ofthe machine showing the. movable jaw in its unlocked or open position; Y

Figure 3- is a plan view of the machine;

Figure l is a detail sect'onal view showing the adjustable feature'ofthe machine for increasing or decreasing the distance between thedadoes;

' Figure a vertical sectional view showwhile the eccentrics andll aresecured to the shaft. Suitable eccentric straps 13 are provided for eacheccentric and arms 14:, 15, 1.6 and 17 extend forwardly from saideccentric strapsbeneath the yoke6. A slide 18 is mounted on the yoke 6to move longitudinally thereon, and a screw 19 is mounted in hearings ina housing 20 on the yoke 6 and has an operating wheel'Ql. This screw ishearing by the hub of the operating wheel on one side of the bearing anda collar 22 secured to the shank of said screw on the opposite side ofthe bearing. The threaded portion of the screw engages a block or lug 23on the slide 18 so that revolution of the screw will operate to feed theslide back and forth on the yoke 6 across the machine. The slide has anarm. thereon supporting a held against longitudinal movement in itshorizontal guide 25 anda similar arm 24 on the housing supports a guide25. Slides 26 are mounted on the guides 25 and V ly thereon,

tively adjusted to the reach carrier plate vertically and horizontally.by means of ad- 25. to move freely forwardly and backwardand-the rearportions of these slidesare pivotally connected with the forward ends ofthe arms ltand 17-so that wvhen the eccentrics are revolved the slides26 will be reciprocated 011 their supporting guides in a horizontaldirection.- A carrier plate 27 is mounted on each SlldB'ilIlCl securedthereto ad ustably by suitable means such as set screws 28[ Uponloosening thesescrews the carrier plates and slides can be reladesiredposition.

29 is a bracket. seated against'the face of 27 and adjustable thereonbolts 30 and 31. This manjusting screws or brackets 29 allows for ner ofmounting the universal adjustment of the groups of knives; Each knifebracket 29 is provided with a series off sockets 32 arranged at anincline therein and adapted to receive the shanks of a correspondingnumber of knives 33 and 34. The knife 33hasan angled upper end 35terminating in atransverse cutting edge 33 and provided with'oppositelyar- '7 ranged cutting edges 36 spaced apart a disto the desired width.of

tance corresponding The knives 3a terminate the groove or dado. attheirupper ends -36 and cooperate with the knife 33 to cut the sockets bysuitable engaging-the shanks andoperating to force them upit beingofcourse -fibers of wood transversely and form the 1 dadofas the knifebracket is reciprocated.

Theknives are adjustable vertically in their means such as set screwslower ends of, the knife wardly. within their sockets or seats until thedesired relative adjustment is obtained, desirable that the knivesshould be on-substantially the same level as regards their cutting edgesin order that the .dadoes or grooves may be cut a uniform -depth.

Plates 38 are secured to the faces of the brackets by suitablemeans suchas bolts 39 and by the adjustment of these bolts, the l knives whenproperlyaligned may secured. Such mounting also allows the be rigidlyconvenient removal of the knivesfrom the the edges 36 the edge 33 willsever the fibers on both "brackets whenever desired. These knives, inthe operation of the machine, have a reciproeating movement forwardlyand backwardly and operate somewhat similar to a saw, en-

I gaging the wood surface and cutting the dadoes therein to the requireddepth while held. in working position bythe operator.

- The transverse cutting edge 33 of the knife 33 will pass between thefibers of the wood the width of the groove or dado while at right anglessubstantially to sides of the groove and form the side walls thereof.The cutting edges 36* of the knives 'the brackets 29 adjacent in similarcutting edges the effect of moving'the 'armsil t and 15,

' 34 will follow after the edges 36 and com plete the cut cooperatingwith the edges 36 until the proper depth of the grooveor dado isreached. Ttis important in a tool of this kind that the knives. cut thewalls of the grooves squarely and cleanly without chipping, orsplintering the.: su'rface of the sill around the grooves and hence thearrange- ;ment'of the knives and their manner of operation is importantin a machine of this kind.- Ithas been found byexperience that provisionmustbe made for disposing. of the chips out by the knives and preventthe knives from clogging. I, therefore, provide recesses 33 between theadjacent knives and grooves 33 extending downwardly in the walls of thesupporting brackets 29 to allow the convenient discharge of the chipsand waste from the cutting edges of the knives.

cut the required depth, a portion of the raised strip 52 will be removedadjacent the outer edge of each groove toprovide a seat for the'windowjambs. It is to be understood that the lower ends of the jambs areusually provided with tongues adapted to be fitted into the grooves, andit is therefore desirable tocut away a portion of the raised surface 52to allowthe jambs to be seated snugly against the sill. 1 7

The arms 15 and 16 operated, by the eccentrics on the'shaft t aremounted to slide in bars 41 which are pivotallyisupported at 42 on thearms 2iand 24 The forward ends of the bars 41 have knives 43 demountablysecured therein with their transversecutting edges on a levelsubsta-ntially with the. cut

ting edges 36 of they knives'33 and 34 when raised, and positioned tomove vertically and cut a square face or shoulder at the inner ends ofthe dadoes or grooves in the sill so that when the work is completedthese grooves or dadoes will have the appearance substantially as shownin Figure 10, and of sufficient depth to receive the ends of the jambs,the square shoulders at the inner ends of the dadoes against which thejambs abut effectually closing and concealing the j0int'"andprotecting'the groovesin the sill from the weather. I.

The adjustment of the screw 19'will have and the knives carried thereby,back and forth on the shaft 14 to increase or decrease the distancebetween these arms and the corre- For this purpose,

the knives to obtain the desired distance between the dadoes.

The shaft 4 being revolved'and the arms reciprocated by the'action ofthe eccentrics, provision is made for raising the knives into contactwith the under surface of the sill. I prefer to provide a treadle orfoot lever 40 pivoted at Men the base and having an adjustable pivotedconnection with a cross-bar 45 on the slides 26. The efiect ofdepressing the lever 40, therefore, will be toraise the slides and theknives to a level where, upon reciprocation of these knives through therevolution of the shaft 4, the grooves or dadoes will be cut in the silland the ends of such grooves squared or faced by the operation of theknives 43. The depth of the dadoes will dedown away from the work or caninstantlypend of course upon the degree of elevation of the knives andthis can be regulated by the operator through a screw 46 mounted in thetreadle 40 and positioned to engage the base and limit downward movementof the treadle and consequently vertical movement of the slides and thecutting knives.

As the arms, slides and their attachments will have considerable weight,I prefer to counterbalance them by means of a lever 47 pivoted at 48 onthe base and having an ad justable weight 49 at one end, and a pivotedlinkconnection 50 at its other end with the inner end of the treadle 40.By means of this counterbalance, the operator can adjust the mechanismso that the treadle can be depressed with comparatively little effort.As the feed of the knives to the work is determined by the depressionofthe trcadle, it isevident that the operator of the machine willfamiliarize himself with the work so that he will raise the knives tocut the dadoes gradually, feeding cut into the wood and as the knivesare held to the work by the pressure of the foot on the treadle, itisevident that the operator, at any time, can allow the knives to dropterminate the dado-cutting operation as soon as the knives have reachedthe required depth of cut. 7 As will appear from the foregoingdescription, the knives 33 and 34 will have a horizontal reciprocatingmovement by the action of the eccentrics while the knives 43 through thevertical oscillation of the bar ll ctuated by the eccentrics will have avertical movement to out into engagement with the sill by the action thesill is seated.

' the machine and them upwardly as they square faces or shoal ders atthe ends of the dadoes, but without reciprocation at a level of thetreadle and at the same time, the knives d3 willbe raised to cut acrossthe grooves or dadoes at the inner ends thereof and form square faces orhoulders at this point.

At the forward portion of the frame, I provide a fixed jaw 51 whereinone edge of A movable-jaw has brackets 54 thereon to engage the otheredge of the sill and clamp it firmlyagainst the fixed jaw. The movablejaw is mounted to swing upon-links 55 pivoted tothe frame of themachine, and an oscillating movement is imparted to said movable jaw bymeans of. links 56 which connect it pivotally with crark arms 57 mountedupon a rock shaft 58 having suitable bearings in the frame of providedwith an operating handle 59.

' In preparing to use the machine, the operator will place the sill tobe grooved between the movable jaws, operate the shaft 58 to firmlyclamp the sill between the jaws, and having firmly secured the sill inthe proper position, will depress the lever 40 and raise thereciprocating cutters or knives into engagement with the under side ofthe sill. The reciprocation of the knives, due to the action of theeccentrics on the shaft 13, will cut the grooves in the sill, and the recesses in the shoulder the sill, the feed depending upon the pressure ofthe foot of the operator upon the lever 40. After a little experiencethe machine attendant will become expert in the operation of this leverand will be able to feed the knives so that the grooves will be cutsmoothly in the surface of the sill without chipping or splintering. Atthe same time that the knives are reciprocated, an oscillating movementwill be imparted to the knives 43 through the bars e'l and the cuttingedges of these knives will cooperate with the knives 33 and remove thecorners at the inner ends of the grooves and provide square shoulders orfaces at this point to receive the ends of the window jambs. Thus, themoves may be formed neatly and expeditiously and with one operation andthe usual labor of cutting out the corners or squarin the faces of theinner ends of the grooves by hand is entirely eliminated. The distancebetween the grooves or dadocs is easily regulated by the lateraladjustment of the eccentrics on the shaft 4 escribcd, and the depth ofthe out can, of course, be regulated by the degree of movement of thefoot lever l0. Thus the machine can be adapted for sills or windowframes of different length and thickness.

1 claim as my invention:

1. A device of the class described including a work support, a knifesupported for below the support, and adapted to swing upwardly tooperative position, a second knife-supported to engage "movementsof thesupports, and causing the slides reciprocably port and adapted away fromthe work-during reciprocation, a tool carrier supportedupon the slidehav- 7 '30. V groove cutting knives therein,

tool carrier rockably mounted and having a from the work during firstmentioned knife to plane and the second knife to chop at the end of; thecut.

2. In combination a to be swung toward and ing a series of tools spacedindirection of reciprocation of the carrier and each having a pair oftransversely opposed and spaced knives, correspondlng knives ahgnedind1- transverse' in respect to the 7 second tool supports rockablymounted, sa1d supports each having "a tool to engage at the endmostportion or the cut. in advance of the first mentioned tools, and meansfor moving and for synchronizing the movements, oft-he supports, toobtain planin and chopping movements, of respective tools. i

3. In combination. a work support, a tool slide reciprocably mountedbeneath the support and adapted to swing toward and away reciprocation,a tool carrier supported upon the slide and having tool to engage attheendmost portion of the cut in advanceof the first mentioned tools, andmeans for moving and synchronizing the movements of the supports toobtain planing and chipping movements of respectivetools.

. 4. A block having lateral grooves in one face, a knife in each groovehaving a transverse cutting edge and longitudinal score ing edges one ateach opposite side, the edges of all knives aligned in direction of thecutting-movement, a plate laterally engaging the knives to clamp them inthe grooves, said block being grooved transversely between eachknifewiththe groove leading laterally in a direction away from the cuttingedges to one of the lateral surfaces of the block.

5. A block having knives arranged in pairs,

the members of which abut, one pair in adeach knife having a transonemember of each longitudinal scoring Vance of the other, verse cutt ngedge, and

pair having in addition edges one at each opposite side aligned indirection of cutting movement, and the other member of each pair havinga single longitudinal scoring edge disposed at thatside remote from thecompanion knife, said edges being also aligned in direction of cuttingmovement, the cutting edges of those -knives which have the singlescoring edge lying ina plane inwardly fromthe cutting edges of thecompanionknives.

work support tool mounted beneath the suptudinal scoring edge disposedat that side and a second erally engaging one 6, A block having, knivesarranged in pairs, one pa r n advance oi the other,

' each knife having a transversecuttingedge,

and one membero't each pair having in addition longitudinat scoringedges one 7o at each; opposlte' side ali ned in direcb 7 tion. ofcutting movement, and the other member of each palr having a singlelongiremote from the compan on knife, said the grooves in pa rsthemembers of which laterally abut, one pair in advance of the other, eachknife having a transverse cutting et ge and one member 01 each pairhaving in addition longitudinal scoring edges one at each opposite sidealigned-in direction of cutting movement and the other member of eachpair having a sin 'le longitudinal scoring edge disposed at that sideremote from the companion knife, said edges being also aligned indirectionof cutting movement, the cutting edges of those kniveswhichhave the single scoring edges, lying in a plane inwardly from thecutting edges of the companion knives, and a plate clampingly latmemberof each pair to secure the pairs in the grooves.

8. A block having a parallel grooves, a pair of knives abuttinglyarranged in each groove, one pair in advance of the other, each knifehaving a transverse cuttingedge and one member of each pair having inaddition longitudinal scoring 05 edges one at eachopposite side alignedin direction "of the cutting movement and the other member of eachpairhaving a single longitudinal scoring edge disposed at that sideremote from the companion knife, said edges being alsoaligned indirection of cutting movement, the cutting edges of those knives whichhave the single scoring edge lying in a plane inwardly from the cuttingedges of the clampinglylaterally engaging one member of each pairtosecure the pairs within the grooves, said block being groovedtransversely between each pair of knives, with the grooves leadinglaterally in a direction away trom the cutting edges to one of thelateral surfaces of the block;

9. A block having inclined grooves, a pair of knives abuttingly arrangedin each groove, one pair in each knitehaving a and one member of ditionlongitudinal outwardly transverse cutting edge each pair having inadconvex scoring edges one at BZtClIOPPOSllZG side aligned in directionof the'cutting movement and 1-50 series of inclined", 1

companion knives, and a plate 115 advance of the other,

the other member or" each pair having a Wardly from the cutting edges ofthe comsingle longitudinal outwardly convex scorpanion knives, and aplate clampingly ening edge disposed at that side remote from gaging onemember of each pair to secure 10 the comganion knife, said edges beingalso the knives Within the grooves.

eli ned in direction of cutting movement, In Witness whereof, I havehereunto set the cutting edges of those knives which have my hand this15th day 01 October, 1925.

' the single scoring edge lying in a plane in- JOHN E. ERICKSON.

